I need to put 2 O2 sensors on my DC header attached to a jdm 1st gen b16a. Should I put each one on a primary (ie cylinders 3 & 4) or should I try to get them each at the bottom of the first Ys which would be cylinders 1+4 and 2+3. I thought the stock manifold was 1+3 and 2+4 but im not sure. Any help would be greatly appreciated!! Thanks guys!

 

Stock is also 1+4 and 2+3.
I need to get this done too, so I'm also interested to know.




[Modified by hondanut, 11:25 PM 10/26/2002]

 

ok so its my understanding that the primary sensor is the 2+3 and the secondard is the 1+4. Is this correct? I cannot seem to find a jdm manual. The only one i could find was for a jdm civic sir in pdf format that someone is selling on ebay. I wonder if thats even legal.

 

https://honda-tech.com/zerothread?id=274113

Take a look at this thread. I think you'll find it useful.

 

Thanks that helps a lot but I still have one more question:

Which O2 sensor is the primary (C16) and which is the secondary (C8) in a Pr3 or Pw0 ecu? One of them is monitoring cylinders 1&4 while the other monitors 2&3. Which is which?





[Modified by erniecars, 7:58 AM 10/27/2002]

 

it is my understanding that both are primary O2 sensors.

that is - it wont matter.

will it? teh both measure O2 content at the same place, but should not be on the paired cylinders,

that is, one should monitor 1&4 the other should monitor 2&3.

i dont think the ECU would be able to tell the difference...

t..

(if you REALLY need to know, i will check for you...)

PS here is the ECU pin outs if you are interested:

http://www.geocities.com/b16aprelude/hondaengines.html

as you can see, they are maked #1 and #2 not primary and secondary...

 

Actually I have ready on this board several times that if you wire them backwards you get bad fuel economy and the engine feels weaker. However I have never seen the correct configuration shown.

 

There is no 'correct' setup. Some of them are reversed. You simply have to try it and then flip if it's incorrect.

 

i have c16 as the primary and c8 as the secondary. i tried to wire them the other way and i got tit to backfire all the time and suck good fuel down. i also tried to wire them both to one which did thte same thing. hope this helps

 

again, I already know that C16 is #1 and C8 is #2 but which is which on the manifold? Is #1 on 1&4 or is it on 2&3?

 

um, really?

i have read if you join both together you get bad milage, but never because they are reversed...

i do note that they thave DIFFERENT plugs and sockets so the cant be reversed stock, so there must be a reason...

ill go home and check my ex. manifold for you tonight... (ie 8hrs from now.)

t..

 

when looking at my engine primary is on the left and secondry is on the right. of a stock b16a1 manifold.

 

so the white plug goes to the right side and the green plug goes to the left side?

That would mean the white aka O2#1 plug goes to the 4&1 primaries located on the crank pulley side of the car while the green aka O2#2 plug goes to the 2&3 primaries located on the tranny side of the manifold? Thats all I need to know

 

Ditto Josh.

 

wait now im even more confused. That pic shows the green connector on 1&4 and the white connector on 2&3, so is the green connector O2 sensor #1? Or is the white connector #1?

 

Ok i figured it out after much much much research.

O2 sensor #1 is:
C16 on the PR3 or PW0 ecu
GREEN connector
monitors cylinders 1 & 4

O2 sensor #2 is:
C8 on the PR3 or PW0 ecu
WHITE connector
monitors cylinders 2 & 3

the USDM b18a configuration is set up with the WHITE connecor in C18 so thats where the confusion was but I think I accidentally wired mine correctly



[Modified by erniecars, 11:31 PM 10/28/2002]

 

Problem Solved.

 

well done Josh!

excellent work! that is a sexy manifold

this thread will be the perfect reference for the next guy/girl who has the same question as you did! (plus u used a good descriptive title that will be easily picked up in hte search)

this is a "model" honda-tech thread

t..

 

...and then comes the problem when you want to run a 4-1 or Turbo.

I researched it for quite a while ..for a yr or so being a PR3 owner.
It is much better to convert to OBD1 if you want to run 4-1 manifold of any kind.

 

I was thinking about that. You could locate the sensors at 1 and 2, but then that's assuming 3 and 4 are running on par with their paired cylinders.

 

if you go the $$$ to turbo, just get a chip that ignores the O2 sensors. I have one but it sucks up a lot of gas.

 

Learn something new everyday

 

I this board

 

yeah, if anyone needs their PR3 ecu reprogrammed w/ these disabled sensors:
- knock sensor
- 2nd 02
- vtec pressure switch

...email/PM me
Click on the JHP/ECU link below for more info.

 

If anyone wants to convert to OBD1 to get out of old technology and be able to run 4-1 header or Turbo while maintaining stock closed loop operation, its easy.
Get the following:

-OBD1 ECU
-OBD1 or OBD2 Distributor
-OBD1 O2 sensor (its 4-wire heated)

And then look for Jason K, here at Honda-Tech, for the conversion harness. His screename is Blown90hatch. The harness is simply plug&play no joke! ..just have to have the above parts installed and in working condition.

I dont know of any other Honda board that provides such wealth of info.
I Honda-Tech.